1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (covering most of Castle Islands)

Prospect in Alaska, United States with commodity Barium-Barite
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308051
Record type Site
Current site name Unnamed (covering most of Castle Islands)

Geographic coordinates

Geographic coordinates: -133.16888, 56.65974 (WGS84)
Relative position Coordinates are at the center of a block of 22 claims including and northwest of the Castle Island barite mine (PE026). Comprises most of the Castle Islands. Much of the claimed area is probably underwater, but note that much of the mining at the Castle Island mine itself was carried on underwater.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Petersburg C-4 NW(quadrangle 1:24,000 scale)

Petersburg N(quadrangle 1:100,000 scale)

Petersburg(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Barium-Barite Critical Primary

Materials information

Materials Type of material
Barite Ore

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 187
USGS model code 28a.1
Deposit model name Massive sulfide, Sierran kuroko
Mark3 model number 44

Nearby scientific data

(1) -133.16888, 56.65974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = See description of the Castle Island barite mine (PE026) which is within this claim block. The block encompasses potential submarine extensions of the mineralization from that mine or potential for new deposits of that type of mineralization. The geology of the various small islands that comprise the Castle Islands and are covered by this claim block is complicated by faulting. The rocks include Devonian fossiliferous limestone; Triassic Hyd Group felsic and intermediate flows and breccias, limestone, and argillite, that host volcanogenic massive sulfide deposits in the area; and Quaternary basalt (Brew, 1997 [OF 97-156-J]).
  • Age = See description of the Castle Island barite mine (PE026) within this claim block.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Active?

Mining district

District name Kupreanof

Comments on the workings information

  • Workings / Exploration = Other than the Castle Island barite mine itself, there is apparently no surface exploration beyond geologic mapping and sampling of outcrops.

Reference information

Bibliographic references

  • Deposit

    U.S. Bureau of Mines, 1980, Claim map, Petersburg quadrangle, Alaska: U.S. Bureau of Mines Map 117, 1 sheet, scale 1:250,000.

  • Deposit

    Grybeck, D.J., Berg, H.C., and Karl, S.M., 1984, Map and description of the mineral deposits in the Petersburg and eastern Port Alexander quadrangles: U.S. Geological Survey Open-File Report 84-837, 86 p., 1 sheet, scale 1:250,000.

  • Deposit

    Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg C-4 quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 97-156-J, 21 p., 1 sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = U. S. Bureau of Mines, 1980

General comments

Subject category Comment text
Deposit Model Name = Barite facies of a Kuroko massive-sulfide model (Cox and Singer, 1986; model 28a); alternatively a barite facies of a Sierran Kuroko model (Bliss, 1992; model 28a1)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-98 H.C. Berg and D.J. Grybeck U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.